added support for multiple IPs on juniper interface

[susanhooks]

Closes: #346

What's Changed

Fixes bug where multiple IPs on a juniper interface were not being parsed. New functionality adds support for multiple IPs.

`In [4]: item = [{'prefix_length': ['172.22.0.0/28', '172.22.0.0/28'], 'ip_address': ['172.22.0
...: .1', '127.22.0.2']}]

In [5]: parse_junos_ip_address(item)
Out[5]:
[{'prefix_length': '28', 'ip_address': '172.22.0.1'},
{'prefix_length': '28', 'ip_address': '127.22.0.2'}]
`

To Do

• Explanation of Change(s)
• Added change log fragment(s) (for more information see the documentation)
• Attached Screenshots, Payload Example
• Unit, Integration Tests
• Documentation Updates (when adding/changing features)
• Outline Remaining Work, Constraints from Design

[Dav-C]

LGTM